Mercurial > hg > octave-nkf
annotate scripts/plot/legend.m @ 8208:f6ca8ff51818
[mq]: graphics-backend
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Fri, 10 Oct 2008 11:07:53 -0400 |
| parents | 73d6b71788c0 |
| children | 79c874fe5100 |
| rev | line source |
|---|---|
| 7017 | 1 ## Copyright (C) 2001, 2006, 2007 Laurent Mazet |
| 6146 | 2 ## Copyright (C) 2006 John W. Eaton |
| 3 ## | |
| 6440 | 4 ## This file is part of Octave. |
| 5 ## | |
| 6 ## Octave is free software; you can redistribute it and/or modify it | |
| 7 ## under the terms of the GNU General Public License as published by | |
| 7016 | 8 ## the Free Software Foundation; either version 3 of the License, or (at |
| 9 ## your option) any later version. | |
| 6440 | 10 ## |
| 11 ## Octave is distributed in the hope that it will be useful, but | |
| 12 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 ## General Public License for more details. | |
| 6146 | 15 ## |
| 16 ## You should have received a copy of the GNU General Public License | |
| 7016 | 17 ## along with Octave; see the file COPYING. If not, see |
| 18 ## <http://www.gnu.org/licenses/>. | |
| 6146 | 19 |
| 20 ## -*- texinfo -*- | |
| 6450 | 21 ## @deftypefn {Function File} {} legend (@var{st1}, @var{st2}, @dots{}) |
| 6977 | 22 ## @deftypefnx {Function File} {} legend (@var{st1}, @var{st2}, @dots{}, "location", @var{pos}) |
| 6146 | 23 ## @deftypefnx {Function File} {} legend (@var{matstr}) |
| 6977 | 24 ## @deftypefnx {Function File} {} legend (@var{matstr}, "location", @var{pos}) |
| 6146 | 25 ## @deftypefnx {Function File} {} legend (@var{cell}) |
| 6977 | 26 ## @deftypefnx {Function File} {} legend (@var{cell}, "location", @var{pos}) |
| 6146 | 27 ## @deftypefnx {Function File} {} legend ('@var{func}') |
| 28 ## | |
| 6895 | 29 ## Display a legend for the current axes using the specified strings |
| 30 ## as labels. Legend entries may be specified as individual character | |
| 31 ## string arguments, a character array, or a cell array of character | |
| 32 ## strings. Legend works on line graphs, bar graphs, etc. A plot must | |
| 33 ## exist before legend is called. | |
| 6146 | 34 ## |
| 6895 | 35 ## The optional parameter @var{pos} specifies the location of the legend |
| 36 ## as follows: | |
| 6146 | 37 ## |
| 6977 | 38 ## @multitable @columnfractions 0.06 0.14 0.80 |
| 39 ## @item @tab north @tab | |
| 40 ## center top | |
| 41 ## @item @tab south @tab | |
| 42 ## center bottom | |
| 43 ## @item @tab east @tab | |
| 44 ## right center | |
| 45 ## @item @tab west @tab | |
| 46 ## left center | |
| 47 ## @item @tab northeast @tab | |
| 48 ## right top (default) | |
| 49 ## @item @tab northwest @tab | |
| 50 ## left top | |
| 51 ## @item @tab southeast @tab | |
| 52 ## right bottom | |
| 53 ## @item @tab southwest @tab | |
| 54 ## left bottom | |
| 55 ## @item | |
| 56 ## @item @tab outside @tab | |
| 57 ## can be appended to any location string | |
| 6146 | 58 ## @end multitable |
| 59 ## | |
| 7001 | 60 ## Some specific functions are directly available using @var{func}: |
| 6146 | 61 ## |
| 7148 | 62 ## @table @asis |
| 6895 | 63 ## @item "show" |
| 6146 | 64 ## Show legends from the plot |
| 6895 | 65 ## @item "hide" |
| 7148 | 66 ## @itemx "off" |
| 6146 | 67 ## Hide legends from the plot |
| 6895 | 68 ## @item "boxon" |
| 6146 | 69 ## Draw a box around legends |
| 6895 | 70 ## @item "boxoff" |
| 6146 | 71 ## Withdraw the box around legends |
| 6895 | 72 ## @item "left" |
| 6146 | 73 ## Text is to the left of the keys |
| 6895 | 74 ## @item "right" |
| 6146 | 75 ## Text is to the right of the keys |
| 76 ## @end table | |
| 77 ## @end deftypefn | |
| 78 | |
| 79 ## PKG_ADD mark_as_command legend | |
| 80 | |
| 81 function legend (varargin) | |
| 82 | |
| 8208 | 83 [ca, varargin, nargin] = __plt_get_axis_arg__ ("legend", varargin{:}); |
| 6257 | 84 nargs = nargin; |
| 6146 | 85 |
| 86 if (nargs > 0) | |
| 87 pos = varargin{nargs}; | |
| 88 if (isnumeric (pos) && isscalar (pos) && round (pos) == pos) | |
| 6395 | 89 if (pos >= -1 && pos <= 4) |
| 6257 | 90 set (ca, "keypos", pos); |
| 6146 | 91 nargs--; |
| 92 else | |
| 93 error ("legend: invalid position specified"); | |
| 94 endif | |
| 95 endif | |
| 96 endif | |
| 6977 | 97 |
| 98 if (nargs > 1) | |
| 99 pos = varargin{nargs-1}; | |
| 7054 | 100 str = varargin{nargs}; |
| 6977 | 101 if (strcmpi (pos, "location") && ischar (str)) |
| 102 set (ca, "keypos", str); | |
| 103 nargs -= 2; | |
| 104 endif | |
| 105 endif | |
| 6146 | 106 |
| 6257 | 107 kids = get (ca, "children"); |
| 108 nkids = numel (kids); | |
| 109 k = 1; | |
| 110 turn_on_legend = false; | |
| 111 | |
| 6146 | 112 if (nargs == 1) |
| 113 arg = varargin{1}; | |
| 114 if (ischar (arg)) | |
| 115 if (rows (arg) == 1) | |
| 116 str = tolower (deblank (arg)); | |
| 117 switch (str) | |
| 118 case {"off", "hide"} | |
| 6257 | 119 set (ca, "key", "off"); |
| 6146 | 120 case "show" |
| 6257 | 121 set (ca, "key", "on"); |
| 6146 | 122 case "toggle" |
| 6257 | 123 val = get (ca, "key"); |
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124 if (strcmpi (val, "on")) |
| 6257 | 125 set (ca, "key", "off"); |
| 126 else | |
| 127 set (ca, "key", "on"); | |
| 128 endif | |
| 6146 | 129 case "boxon" |
| 6257 | 130 set (ca, "key", "on", "keybox", "on"); |
| 6146 | 131 case "boxoff" |
| 6257 | 132 set (ca, "keybox", "off"); |
| 6146 | 133 otherwise |
| 8208 | 134 typ = get (kids (k), "type"); |
| 135 while (k <= nkids && ! strcmp (typ, "line") && | |
| 136 ! strcmp (typ, "hggroup")) | |
| 6257 | 137 k++; |
| 138 endwhile | |
| 139 if (k <= nkids) | |
| 140 turn_on_legend = true; | |
| 8208 | 141 if (strcmp (typ, "hggroup")) |
| 142 hgkids = get (kids(k), "children"); | |
| 143 for j = 1 : length (hgkids) | |
| 144 hgobj = get (hgkids (j)); | |
| 145 if (isfield (hgobj, "keylabel")) | |
| 146 set (hgkids(j), "keylabel", arg); | |
| 147 break; | |
| 148 endif | |
| 149 endfor | |
| 150 else | |
| 151 set (kids(k), "keylabel", arg); | |
| 152 endif | |
| 6257 | 153 else |
| 154 warning ("legend: ignoring extra labels"); | |
| 155 endif | |
| 6146 | 156 endswitch |
| 157 nargs--; | |
| 158 else | |
| 159 varargin = cellstr (arg); | |
| 6740 | 160 nargs = numel (varargin); |
| 6146 | 161 endif |
| 162 elseif (iscellstr (arg)) | |
| 163 varargin = arg; | |
| 164 nargs = numel (varargin); | |
| 165 else | |
| 166 error ("legend: expecting argument to be a character string"); | |
| 167 endif | |
| 168 endif | |
| 169 | |
| 6272 | 170 if (nargs > 0) |
| 171 have_data = false; | |
| 172 for i = 1:nkids | |
| 7148 | 173 if (strcmp (get (kids(k), "type"), "line") |
| 174 || strcmp (get (kids(k), "type"), "surface") | |
| 8208 | 175 || strcmp (get (kids(k), "type"), "patch") |
| 176 || strcmp (get (kids(k), "type"), "hggroup")) | |
| 6272 | 177 have_data = true; |
| 178 break; | |
| 179 endif | |
| 180 endfor | |
| 181 if (! have_data) | |
| 182 warning ("legend: plot data is empty; setting key labels has no effect"); | |
| 183 endif | |
| 6147 | 184 endif |
| 185 | |
| 6575 | 186 warned = false; |
| 6146 | 187 for i = 1:nargs |
| 188 arg = varargin{i}; | |
| 189 if (ischar (arg)) | |
| 7148 | 190 while (k <= nkids |
| 191 && ! (strcmp (get (kids(k), "type"), "line") | |
| 192 || strcmp (get (kids(k), "type"), "surface") | |
| 8208 | 193 || strcmp (get (kids(k), "type"), "patch") |
| 194 || strcmp (get (kids(k), "type"), "hggroup"))) | |
| 6257 | 195 k++; |
| 196 endwhile | |
| 197 if (k <= nkids) | |
| 8208 | 198 if (strcmp (get (kids(k), "type"), "hggroup")) |
| 199 hgkids = get (kids(k), "children"); | |
| 200 for j = 1 : length (hgkids) | |
| 201 hgobj = get (hgkids (j)); | |
| 202 if (isfield (hgobj, "keylabel")) | |
| 203 set (hgkids(j), "keylabel", arg); | |
| 204 break; | |
| 205 endif | |
| 206 endfor | |
| 207 else | |
| 208 set (kids(k), "keylabel", arg); | |
| 209 endif | |
| 6257 | 210 turn_on_legend = true; |
| 6450 | 211 k++; |
| 6257 | 212 elseif (! warned) |
| 213 warned = true; | |
| 214 warning ("legend: ignoring extra labels"); | |
| 215 endif | |
| 6146 | 216 else |
| 8208 | 217 arg |
| 218 get(kids(k),"type") | |
| 219 k | |
| 6146 | 220 error ("legend: expecting argument to be a character string"); |
| 221 endif | |
| 222 endfor | |
| 223 | |
| 6257 | 224 if (turn_on_legend) |
| 225 set (ca, "key", "on"); | |
| 6146 | 226 endif |
| 227 | |
| 228 endfunction | |
| 229 | |
| 230 %!demo | |
| 231 %! close all; | |
| 232 %! plot(1:10, 1:10); | |
| 233 %! title("a very long label can sometimes cause problems"); | |
| 6977 | 234 %! legend({"hello world"}, "location", "northeastoutside") |
| 6146 | 235 |
| 236 %!demo | |
| 237 %! close all; | |
| 238 %! labels = {}; | |
| 239 %! for i = 1:5 | |
| 240 %! plot(1:100, i + rand(100,1)); hold on; | |
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241 %! labels = {labels{:}, cstrcat("Signal ", num2str(i))}; |
| 6146 | 242 %! endfor; hold off; |
| 243 %! title("Signals with random offset and uniform noise") | |
| 244 %! xlabel("Sample Nr [k]"); ylabel("Amplitude [V]"); | |
| 6977 | 245 %! legend(labels, "location", "southoutside") |
| 6146 | 246 %! legend("boxon") |